CONCUR LI A— BITHYE A. 35. 135 



The shells answerinoj to this generic character are with much 

 propriety separated from the Venus, in consequence of their 

 being furnished with a lateral tooth in each valve, and which is 

 generally placed on the anterior or cartilage side All the 

 British species have the internal margin very entire. 



Cyprina testd oblique eordata, transversun striata^ areaUt isiaudi<a. 



posited obsoleld, denlibus tribus. 

 Shell obliquely heart-shaped, striate transversely, with the hinder 



impression obscure, and three teeth. 

 Venus Islandica Linn. Syst. Nat. p. J 131. 



Gmelin, Syst. p. 3271 



Tiu'ton, Linn. Syst. iv. p. 221. 



Pennant, iv. p. 205, tab. 56. 



Chemnitz, vi. p. 3,40, tab. 33, fig. 341, 342. 



Montagu, Test. Brit, p, 114. 



Donovan, British Shells, iii. tab. 77. 



Turton, British Fauna, p. 157. 



Liinn. Trans, viii. p. 83. 



Dorset Catal. p. 35, tab, 6, fig. 5. 



Dillwyn, Descript. Catal. p. 176. 



Turton, Conch, Diet. p. 23a 

 Pectunculus crassus. JJa Costa, p. 183, tab. 14, fig, 5. 

 Pectunculus niaximus. Lister, Conch, tab. 272, fig. 108;. 

 Var. rugis crassis transversis. 



with thick transverse ridges. 

 Mms, nost. On most open coasts. 



Shell growing to four inches or more in diameter, strong, 

 thick, covered with a glossy brown or olive skin, under which it 



